The ornamental design for a buffet and china cabinet, as shown and described.
FIG. 1 is a front view of a buffet and china cabinet according to the invention.
FIG. 2 is a left front perspective view of a buffet and china cabinet according to the invention.
FIG. 3 is a right side elevation view of a buffet and china cabinet according to the invention. The left side elevation being a mirror-image thereof; and,
FIG. 4 is a top view of a buffet and china cabinet according to the invention. The broken lines illustrate features that are not part of the claimed invention. The backside of the article is not considered part of the invention and is not illustrated.